avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/board/freescale/mpc8313erdb/README

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+Freescale MPC8313ERDB Board
+-----------------------------------------
+
+1.	Board Switches and Jumpers
+
+	S3 is used to set CONFIG_SYS_RESET_SOURCE.
+
+	To boot the image at 0xFE000000 in NOR flash, use these DIP
+	switch settings for S3 S4:
+
+	+------+	+------+
+	|      |	| **** |
+	| **** |	|      |
+	+------+ ON	+------+ ON
+	  4321		  4321
+	(where the '*' indicates the position of the tab of the switch.)
+
+	To boot the image at the beginning of NAND flash, use these
+	DIP switch settings for S3 S4:
+
+	+------+	+------+
+	| *    |	|  *** |
+	|  *** |	| *    |
+	+------+ ON	+------+ ON
+	  4321		  4321
+	(where the '*' indicates the position of the tab of the switch.)
+
+	When booting from NAND, use u-boot-nand.bin, not u-boot.bin.
+
+2.	Memory Map
+	The memory map looks like this:
+
+	0x0000_0000	0x07ff_ffff	DDR		 128M
+	0x8000_0000	0x8fff_ffff	PCI MEM		 256M
+	0x9000_0000	0x9fff_ffff	PCI_MMIO	 256M
+	0xe000_0000	0xe00f_ffff	IMMR		 1M
+	0xe200_0000	0xe20f_ffff	PCI IO		 16M
+	0xe280_0000	0xe280_7fff	NAND FLASH (CS1) 32K
+	0xf000_0000	0xf001_ffff	VSC7385 (CS2)	 128K
+	0xfa00_0000	0xfa00_7fff	Board Status/	 32K
+					LED Control (CS3)
+	0xfe00_0000	0xfe7f_ffff	NOR FLASH (CS0)	 8M
+
+	When booting from NAND, NAND flash is CS0 and NOR flash
+	is CS1.
+
+3.	Definitions
+
+3.1	Explanation of NEW definitions in:
+
+	include/configs/MPC8313ERDB.h
+
+	CONFIG_MPC83xx		MPC83xx family
+	CONFIG_MPC831x		MPC831x specific
+	CONFIG_MPC8313ERDB	MPC8313ERDB board specific
+
+4.	Compilation
+
+	Assuming you're using BASH (or similar) as your shell:
+
+	export CROSS_COMPILE=your-cross-compiler-prefix-
+	make distclean
+	make MPC8313ERDB_XXX_config
+	(where XXX is:
+	   33 - 33 MHz oscillator, boot from NOR flash
+	   66 - 66 MHz oscillator, boot from NOR flash
+	   NAND_33 - 33 MHz oscillator, boot from NAND flash
+	   NAND_66 - 66 MHz oscillator, boot from NAND flash)
+	make
+
+5.	Downloading and Flashing Images
+
+5.1	Reflash U-Boot Image using U-Boot
+
+	NOR flash:
+
+	=>run tftpflash
+
+	You may want to try
+	=>tftpboot $loadaddr $uboot
+	first, to make sure that the TFTP load will succeed before it
+	goes ahead and wipes out your current firmware.  And of course,
+	have an alternate means of programming the flash available
+	if the new U-Boot doesn't boot.
+
+	NAND flash:
+
+	=>tftpboot $loadaddr <filename>
+	=>nand erase 0 0x80000
+	=>nand write $loadaddr 0 0x80000
+
+	...where 0x80000 is the filesize rounded up to
+	the next 0x20000 increment.
+
+5.2	Downloading and Booting Linux Kernel
+
+	Ensure that all networking-related environment variables are set
+	properly (including ipaddr, serverip, gatewayip (if needed),
+	netmask, ethaddr, eth1addr, rootpath (if using NFS root),
+	fdtfile, and bootfile).
+
+	Then, do one of the following, depending on whether you
+	want an NFS root or a ramdisk root:
+
+	=>run nfsboot
+	or
+	=>run ramboot
+
+6	Notes
+
+	The console baudrate for MPC8313ERDB is 115200bps.